Renewable fuse plug



May 24, 1932. 9 M'DAWS 1,860,237

' RENEWABLE FUSE PLUG Filed July 18, 1931 20 l w \k "-a\l 1\ 19 W 18 q;- I 4 E 18 I 11 Patented May 24, 1932 8 PATENT OFFICE M. DAVIS, OF WEST PITTSTON, PENNSYLVANIA RENEWABLE FUSE PLUG Application filed July 18,

This invention relates to a renewable fuse plug and has for its primary object to provide, in a manner as hereinafter set forth, a fuse plug in which the fuse may be'readily removed when blown out, and a new fuse substituted therefor, thereby enabling the plug to be used indefinitely and consequently effecting a material saving in the ultimate cost of plugs.

A further object of the invention is to provide a fuse plug of the in which the fuse may be readily replaced without the use of tools.

A further object of the invention is to provide a fuse plug of the character aforesaid including a se carrying cap section which may be readily inserted into a plug section in engagement with contact members carried by the latter, the sections having coactin means for insuring the proper position of t e fuse with respect to the contact members, and the cap section and one of the contact members having coacting means for detachably securing the cap section in position.

' With the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts as hereinafter more particularly described, and as illustrated in the accompanying drawings, wherein is shown an embodiment of the invention, but it is to be understood that the description and drawing are to be considered as illustrative rather than limitative.

In the accompanying drawings in which like numerals are employed to designate like parts throughout the several views:

Figure 1 1s a vertical section through a fuse plug in accordance with this invention.

Figure 2 is a view similar to Figure 1 but taken at a right angle thereto.

Figure 3 is a perspective disassembled view of the plug. I

Fi re 4 is a. section taken on the line 4-4 of Figure 1.

Figure 5 is a plan of the removable fuse as the same appears before becoming a ,part of the plug.

A fuse plug. in accordance with this invention includes a plug section indicated genercharacter aforesaid l Beneath one of 1931. Serial No. 551,770.

ally at l and a cap section indicated generally at 2. The plug section 1 is of hollow construction provided with a threaded contact band 3 encircling the same and further provided with a contact stud 4 extending through the bottom wall thereof. Disposed Within the section 1 is a contact strip 5 which is of angular construction and one end of which is secured to the stud 4. An opposite end portion 6 of the strip 5 is bent at an out- 0 ward angle and is disposed within a recess 7 in the inner face of the section adjacent the top of the latter. Disposed opposite the contact strip 5 is a contact strip 8 which extends through an opening 9 in the wall of the section 1, and which terminates at its lower end in an upstanding portion 10 disposed within a recess 11 formed in the outer face of the section 1 beneath the band 8. The band 3 is in engagement with the portion 10 and prefer- 7 ably is soldered thereto as indicated at 12.

. The upper end portion 13 of the strip 8 is bent outwardly and is disposed within a recess 14 in the inner face of the section 1 adjacent the top-of the latter. The contact strips 15 and 7 8 are formed of resilient material and have an inherent tendency to spring inwardly as shown in Figure 3. v

The cam section 2 is of hollow construction formed at its top with an outwardly diso rected flange 15. The upper face of the section 2 is formed with a recess 16 within which is disposed a transparent cover 17. The wall of the section 2 is formed with a pair of oppositely disposed slots 18 through which a fuse so element 19 extends, the end portions20 of the fuse element being bent upwardly along the 'outer face of the cap section for engagement with the contact strips 5 and 8 of the plug section 1. In order that the end portions 20 of the fuse element 19 will be properly positioned with respect to the contact strips 5 and 8, the flange 15 is formed in its peripheral face with a recess 21 for receiving therein a projection 22 formed on and pro- 05 jecting upwardly from the plug section 1. the slots 18, the wallof the cap section 2 is formed with an opening 23 for receiving a bead 24'formed on and projecting inwardly from the contact strip 5.

Upon the insertion of the cap section 2 within the plug section 1, the head 24 is projected into the opening 23 for coaction with the wall of the latter to detachably secure the cap section 2 in position.

In the event of the fuse element 19 being rendered useless, the same may be readily replaced simply by withdrawing the cap section 2 from the plug section 1, and removing the damaged fuse element from the slots 18. A new fuse element then may be inserted through the slots 18 and the end portions of the fuse element bent upwardly, after which the cap section 2 may be returned to its position within the plug section 1.

It is thought that the many advantages of a renewable fuse plug in accordance with this invention will be readily apparent, and although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the size, shape and arrangement of parts may be resorted to, so long as such changes fall within the scope of the invention as defined in the ap ended claims.

at I claim is 1. A fuse plug comprising, a hollow plug section having a contact band encircling the same and a contact stud extending thereinto, oppositely disposed contact strips extending lengthwise of the inner face of the plu section and respectively engaging the stu and band, said strips being resilient and having an inherent tendency to spring inwardly, a

hollow cap section for insertion within the plug section and having diametrically opposed, circumferentially extending slots in the wall thereof, and a fuse element extending diametrically of said cap section through sa1d slots and having the end portions thereof arranged exteriorl of said wall and bent .in a direction towars the outer end of the cap section for engagement with said contact stri s.

2. A se plug comprising, a hollow plug section having a contact band encircling the same and a contact stud extending thereinto,

- ppositely disposed contact strips extending o a ong the inner face of'the plug section and respectively engaging the stud and band, said stri s being resilient and having an inherent ten ency to spring inwardly, a hollow cap section for insertion within the plug section and having oppositely disposed slots in the along the inner face of the plug section and respectively engaging the stud and band, said stri s being resilient and having an inherent ten ency to spring inwardly, a hollow cap section for insertion within the plug section and having oppositely disposed slots in the wall thereof, a fuse element extending through said slots and having end portions thereof bent upwardly for engagement with said contact strips, the wall of said ca section having an opening beneath one 0 said slots, and a bead formed on one of said contact strips and projecting inwardly therefrom for engagement in said opening to detachably secure the cap section in posit-ion.

In testimony whereof, I afiix my signature hereto.

RICHARD M. DAVIS.

section having a contact band encircling the same and a contact stud extending thereinto, 

